Question

(x-2)(x+2)-x(x-13) при x = -2/13

Answer 1

$x { }^{2} - 4 - x {}^{2} + 13x \\ - 4 + 13x \\ \times = - \frac{2}{13 } \\ 13 \times ( - \frac{2}{13}) = - 2 - 4 = - 6$

Answer 2

$x ^2 - 4 - x ^{2} + 13x \\ - 4 + 13x \\ - 4 + 13 \times - \frac{2}{13} \\ = - 6$